Project def: get rid of 'scalding' sub-project
Project def: organization is 'YPG'
Log Settings: add Spark dependency to make it work

* NB: this *shouldn't* be needed, but I couldn't make it work otherwise. TODO is on the code.
Scalac Settings: add 'reflectiveCalls' option
Spark Settings: make dependencies private
Split between Spark and 'normal' utilities